We have been racing the original one in our Bocar for thirty years and never pulled shaft out of a bearing. And this is roadrace stuff we do. We've twisted them like candy canes, broke the flanges off, ripped the splines off, but never had one slip out. Finally cured our breakage issues by swapping them out for a pair of narrowed and re-splined '59 buick units. Sounds like the bearing went south and wore the axle down. How did the axle look under the bearing race?